This story seems to me, to merely state that, sin has natural consiquences.
If I stick a pencil up your ass, won't you attack me, and beat the living shit out of me?
So wheather or not the abuser or murderer was punished for his action (as RECORDED in the bible) does not matter. Because one sin, brought forth another sin, which cancel out the originally committed the sin. The new sin, will bring forth a chain reaction of more sins, that will naturally punish that sin.
In modern days, the fear of being caught after a crime seems to punish the sin committed, and then the person is caught (ussually I think) and executed. So the person is punished. It is only natural that sins get punished.
It is unfortinate though, that people, seemingly totally innocent, get caught up in all of this crap.
And since one sin, can be against a totally innocent person, than it is only natural that it can bring forth other conflicts that lead to the mishaps of other innocent people.
Imagine if we just all began forgiving one another, than we wouldn't react to each other sins in such away to make more sins. Than sin will continouslly decrease as long as we just keep forgiving. Now, this cannot really happen on earth these days, but it is just hypathetical, as the murderer will always (ussually) be a murderer, unless he REALLY wants to change REALLY BADLY.